Calculate the sum of the series :

INPUT:

First line contains the number of test cases t, for each test case a single line representing m and n with two space separated integers.

OUTPUT:

For each test case, a single line representing thee sum of the series in the form of p/q.

Constraints:

1 ≤ t ≤ 100

1 ≤ m, n ≤ 30

SAMPLE INPUT
1
2 3

SAMPLE OUTPUT
31/224

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